Vector illustration of proletarian woman waves the red flag

Working of a sluice or lock (phase 1)

Working of a sluice or lock (phase 2)

Working of a sluice or lock (phase 3)

Working of a sluice or lock (phase 4)

Working of a sluice or lock (phase 5)

Working of a sluice or lock (phase 6)

Working of a sluice or lock (phase 7).

Working of a sluice or lock (phase 8)